Hi Emily,
I don't know if anyone has developed an actual ratio chart for ball pythons in deli cups, but I can tell you that I'd recommend the 32oz size for baby ball pythons and the 96oz size for juvies. If there is enough extra space in the cup to allow for "bouncing around" during shipment then you can fill it with some wads of paper towel.
Don't forget to use the code BPnet40 (case sensitive) to get 40% off your first shipment at ShipYourReptiles!
Hope that helps!
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